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The following phenomena are translation in mathematics: () A. Leaves fall from trees B. Elevator rises from the bottom to the top C. CD-ROM runs in CD-ROM drive D. Satellite.
A, the leaves fall from the tree, not in a straight line, which does not conform to the definition of translation, so it is wrong;

B, the elevator moves in a straight line from the bottom to the top, which conforms to the definition of translation, so it is correct;

C, the CD running in the CD-ROM drive is rotating, so it is wrong;

D, the satellite does not move in a straight line around the earth, so it is wrong.

So choose B.

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